JP2002369406A - System-interconnected power system - Google Patents
System-interconnected power systemInfo
- Publication number
- JP2002369406A JP2002369406A JP2001173359A JP2001173359A JP2002369406A JP 2002369406 A JP2002369406 A JP 2002369406A JP 2001173359 A JP2001173359 A JP 2001173359A JP 2001173359 A JP2001173359 A JP 2001173359A JP 2002369406 A JP2002369406 A JP 2002369406A
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- Japan
- Prior art keywords
- power
- supply system
- power supply
- generated
- storage means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、太陽光発電システ
ムと蓄電システムとを併用した系統連系形の電源システ
ムに関し、太陽光発電電力の電源系統への売電と、夜間
電力の蓄電による電力ピークシフト、および、負荷の大
きさが急峻に変動する負荷へのピーク電力供給とを組み
合わせたシステムに好適な系統連系形電源システムに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grid-connected power supply system in which a photovoltaic power generation system and a power storage system are used in combination. The present invention relates to a grid-connected power supply system suitable for a system in which a peak shift and a peak power supply to a load whose load varies sharply are combined.
【０００２】[0002]
【従来の技術】太陽光発電システムは、太陽電池の発電
電力を負荷に供給すると供に、余剰電力を電源系統に売
電できる。一方、電力ピークシフト手段としては、蓄電
池を用い、電気料金の安い夜間電力を蓄電し、電力の利
用度の大きい昼間に使用する蓄電システムが知られてい
る。このような、太陽光発電と蓄電とを組み合せて使用
する場合には、電気料金の安い夜間に蓄電した電力を、
昼間に売電しないようにする必要がある。2. Description of the Related Art A photovoltaic power generation system can supply surplus power to a power supply system while supplying power generated by a solar cell to a load. On the other hand, as a power peak shift means, a power storage system is known which uses a storage battery to store nighttime power at a low electricity rate and uses the power during the daytime when the power usage is high. When using such a combination of photovoltaic power generation and power storage, the power stored at night when the electricity rate is low,
It is necessary not to sell electricity during the day.
【０００３】太陽光発電と蓄電とを組み合わせたシステ
ムとしては、特開平１０−２０１１２９号公報に記載さ
れているように、太陽光発電の入力に対して開閉器を介
して蓄電池を接続し、受電端の電力検出値が所定の値を
超えているとき、蓄電池に接続された開閉器をオンし、
蓄電池から電力を放電させる方式がある。これにより、
受電端の電力が所定の値を超えないようにする。As a system combining solar power generation and power storage, as described in Japanese Patent Application Laid-Open No. H10-2011129, a storage battery is connected to a solar power generation input via a switch to receive power. When the power detection value at the end exceeds a predetermined value, the switch connected to the storage battery is turned on,
There is a method of discharging power from a storage battery. This allows
Make sure that the power at the receiving end does not exceed a predetermined value.
【０００４】また、特開２０００−９５１７９号公報に
は、分電盤入力線の電力を検出するセンサ、負荷に供給
される電力を検出するセンサ、太陽電池の電力を検出す
るセンサ、蓄電池からの放電電力を検出するセンサ等を
設け、分電盤入力の電力、即ち、電源系統側電力の大き
さから蓄電池の放電を制御する方式が知られている。Japanese Patent Application Laid-Open No. 2000-95179 discloses a sensor for detecting power of a distribution board input line, a sensor for detecting power supplied to a load, a sensor for detecting power of a solar cell, and a sensor for detecting power from a storage battery. There is known a method in which a sensor or the like for detecting the discharge power is provided, and the discharge of the storage battery is controlled based on the power input to the distribution board, that is, the magnitude of the power on the power system side.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前記特
開平１０−２０１１２９号公報に記載されるものは、太
陽光発電の直流電力と蓄電池の直流電力とを、同じ電力
変換器で交流電力に変換して電源系統に出力する。この
ため、太陽電池の電力と蓄電池からの放電電力をと独立
に制御できず、最大電力追従制御のような太陽光発電に
固有な制御と、蓄電池の放電制御とを両立するのが難し
い。However, the one disclosed in Japanese Patent Application Laid-Open No. Hei 10-201129 converts the DC power of solar power generation and the DC power of a storage battery into AC power by the same power converter. Output to the power system. Therefore, the power of the solar cell and the discharge power from the storage battery cannot be controlled independently of each other, and it is difficult to achieve both control unique to solar power generation such as maximum power follow-up control and discharge control of the storage battery.
【０００６】特開２０００−９５１７９号公報に記載さ
れるものは、全負荷電力、太陽光発電電力、蓄電池から
の放電電力を常時監視し、全負荷電力から太陽光発電電
力を除いた値が所定の設定値を超える量を演算し、その
値だけ蓄電池からの放電電力を制御する。このため、電
力を検出するためのセンサや電力の演算誤差などの影響
があり、精度よく電力ピーク補償を実行するのが難し
い。[0006] Japanese Unexamined Patent Publication No. 2000-95179 continuously monitors the full load power, the photovoltaic power, and the discharge power from the storage battery, and a value obtained by removing the photovoltaic power from the full load power is a predetermined value. Is calculated, and the discharge power from the storage battery is controlled by the calculated value. For this reason, there is an influence of a sensor for detecting power, a calculation error of power, and the like, and it is difficult to accurately perform power peak compensation.
【０００７】本発明は、太陽光発電と蓄電とを組み合わ
せたシステムにおいて、太陽光発電電力の余剰分を売電
する一方で、蓄電システムに蓄積された電力を売電しな
いようにする。また、太陽光発電と組み合せた場合で
も、蓄電システムからの放電により精度よく系統電力ピ
ークを抑制できるようにする。According to the present invention, in a system in which photovoltaic power generation and power storage are combined, surplus solar power is sold while power stored in the power storage system is not sold. In addition, even when combined with photovoltaic power generation, system power peaks can be accurately suppressed by discharging from a power storage system.
【０００８】[0008]
【課題を解決するための手段】本発明は、太陽電池の発
電電力を入力する手段と、電源系統の電力又は太陽電池
の発電電力を蓄電する蓄電手段と、この蓄電手段に電力
を充電する手段と、前記蓄電手段から電力を放電する手
段と、太陽電池又は蓄電手段の電力を交流電力に変換し
電源系統に出力する手段、あるいは、電源系統から交流
電力を入力する手段と、電源系統側の電力を検出する手
段とを有し、太陽電池の発電電力を負荷に給電又は蓄電
手段に充電し、負荷電力が太陽光発電電力より小さい場
合には、発電電力を電源系統に売電すると共に、電源系
統の電力が所定の値を超えないように蓄電手段に蓄電し
た電力を放電するものであり、これにより、太陽光発電
電力の大きさに係わらず、電源系統から負荷に供給させ
る電力が所定の値を超えないように蓄電池から電力を放
電する。SUMMARY OF THE INVENTION The present invention provides a means for inputting power generated by a solar cell, a power storage means for storing power of a power supply system or a power generated by a solar cell, and a means for charging the power to the power storage means. Means for discharging power from the power storage means, means for converting the power of the solar cell or power storage means to AC power and outputting the AC power to the power system, or means for inputting AC power from the power system, Means for detecting the power, the power generated by the solar cell is supplied to the load or the storage means is charged, and when the load power is smaller than the photovoltaic power, the generated power is sold to the power system, The power stored in the power storage means is discharged so that the power of the power supply system does not exceed a predetermined value, whereby the power supplied from the power supply system to the load regardless of the magnitude of the photovoltaic power can be reduced. The value of the To discharge the electric power from the battery so as not to exceed.
【０００９】本発明では、太陽光発電の発電電力と負荷
電力との差分が、電源系統に対して売電される。一方、
蓄電池から放電される電力は、電源系統から負荷に供給
される電力が、所定の大きさを超えた場合に、蓄電池か
ら電力を放電し、その放電電力は、電源系統側の電力
が、所定の大きさを超えないように制御される。このた
め、太陽光発電電力が負荷の消費電力より大きく、電源
系統に売電されるような条件では、電源系統側の電力が
所定の設定値以下となるため、蓄電池からの放電はな
い。一方、夜間や朝夕、あるいは、昼間でも曇りや雨で
太陽光発電電力が少ないか無い場合には、負荷電力が大
きいときには電源系統から供給させる電力が所定の設定
値を超過する条件となる。この場合には、系統から供給
される電力が所定の設定値を超えないように、蓄電池か
らの放電電力が制御される。In the present invention, the difference between the power generated by the solar power generation and the load power is sold to the power supply system. on the other hand,
The electric power discharged from the storage battery discharges the electric power from the storage battery when the electric power supplied from the power supply system to the load exceeds a predetermined magnitude. It is controlled not to exceed the size. For this reason, under the condition that the photovoltaic power is larger than the power consumption of the load and is sold to the power system, the power on the power system side is equal to or less than the predetermined set value, and the storage battery does not discharge. On the other hand, when the power generated by the solar power is small or not at night, morning and evening, or even in the daytime due to cloudiness or rain, when the load power is large, the condition is such that the power supplied from the power supply system exceeds a predetermined set value. In this case, the discharge power from the storage battery is controlled so that the power supplied from the grid does not exceed a predetermined set value.
【００１０】本発明は、太陽光発電と蓄電池を組み合わ
せたシステムであっても、太陽光の発電電力の大きさに
係わらず、電源系統側に売電される電力は、太陽光発電
電力の余剰分のみとなり、蓄電池に蓄電された電力が売
電分に使用されることはない。また、電源系統側の電力
を常時監視し、太陽光発電電力分とは独立して、蓄電池
からの放電電力を制御するため、高精度に電源系統の電
力ピークを抑制できる。According to the present invention, even in a system in which solar power generation and a storage battery are combined, the power sold to the power supply system side is the surplus of the solar power, regardless of the amount of power generated by the solar power. Power, and the power stored in the storage battery is not used for the power sale. In addition, since the power on the power supply system side is constantly monitored and the discharge power from the storage battery is controlled independently of the amount of the photovoltaic power, the power peak of the power supply system can be suppressed with high accuracy.
【００１１】[0011]
【発明の実施の形態】以下、本発明の第１の実施の形態
を図１により説明する。電源系統１から負荷３に対して
系統電力が供給されている。配線２の分電盤４に電源シ
ステム５が接続されており、また、電源システム５は、
逆流防止ダイオード８を介して太陽電池７からの発電電
力を入力する。電源システム５は、平滑コンデンサ５０
１、双方向ＡＣ／ＤＣ変換器５０２、蓄電池５０６、双
方向ＤＣ／ＤＣ変換器５０５、開閉器５０３、系統電圧
検出用トランス５０４、交流電流検出器６からの検出信
号と系統電圧検出用トランス５０４からの検出信号とか
ら系統電力を演算する電力検出手段５０７、電力検出手
段５０７の演算結果に応じ蓄電池５０６からの放電ある
いは充電を制御するための充放電制御手段５０８から構
成される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIG. System power is supplied from the power system 1 to the load 3. The power supply system 5 is connected to the distribution board 4 of the wiring 2, and the power supply system 5
The power generated from the solar cell 7 is input via the backflow prevention diode 8. The power supply system 5 includes a smoothing capacitor 50.
1. Bidirectional AC / DC converter 502, storage battery 506, bidirectional DC / DC converter 505, switch 503, system voltage detection transformer 504, detection signal from AC current detector 6 and system voltage detection transformer 504 And a charge / discharge control unit 508 for controlling discharge or charge from the storage battery 506 in accordance with the calculation result of the power detection unit 507.
【００１２】ここで、双方向ＤＣ／ＤＣ変換器５０５
は、充放電制御手段５０８の演算結果に基づき、蓄電池
５０６からの放電電流や蓄電池５０６への充電電流を制
御する。一方、双方向ＡＣ／ＤＣ変換器５０２は、太陽
電池７からの発電電力を交流電力に変換し電源系統１に
出力する。また、双方向ＡＣ／ＤＣ変換器５０２は、平
滑コンデンサ５０１の直流電圧Vdcを調整する機能を持
っており、この平滑コンデンサ５０１の直流電圧を調整
することで、太陽電池７から最大電力を取り出せるよう
に制御する。Here, bidirectional DC / DC converter 505
Controls the discharge current from the storage battery 506 and the charging current to the storage battery 506 based on the calculation result of the charge / discharge control unit 508. On the other hand, bidirectional AC / DC converter 502 converts the power generated from solar cell 7 into AC power and outputs it to power supply system 1. The bidirectional AC / DC converter 502 has a function of adjusting the DC voltage Vdc of the smoothing capacitor 501. By adjusting the DC voltage of the smoothing capacitor 501, the maximum power can be extracted from the solar cell 7. To control.
【００１３】分電盤４に設けた交流電流検出器６により
検出された電源系統側の交流電流は、電力検出５０７に
おいて、系統電圧検出用トランス５０４の検出信号と乗
算され、電源系統側の電力検出値となる。充放電制御５
０８では、電力検出値の大きさに応じ、蓄電池５０６か
らの放電電流、あるいは、蓄電池５０６への充電電流を
制御する。蓄電池５０６からの放電、あるいは充電は、
双方向ＤＣ／ＤＣ変換器５０５により実行される。ここ
で、平滑コンデンサ５０１の直流電圧Ｖｄｃは、双方向
ＡＣ／ＤＣ変換器５０２により、太陽電池７から取り出
せる電力が最大になるように調整される。双方向ＤＣ／
ＤＣ変換器５０５は、調整されたVdc値に対して、蓄電
池５０６からの放電、あるいは充電を行う。The AC current on the power supply system side detected by the AC current detector 6 provided on the distribution board 4 is multiplied by a detection signal from the system voltage detection transformer 504 in a power detection 507, and the power supply system side power is detected. It becomes the detection value. Charge / discharge control 5
In step 08, the discharging current from the storage battery 506 or the charging current to the storage battery 506 is controlled according to the magnitude of the detected power value. Discharging or charging from the storage battery 506
This is executed by the bidirectional DC / DC converter 505. Here, the DC voltage Vdc of the smoothing capacitor 501 is adjusted by the bidirectional AC / DC converter 502 so that the power that can be extracted from the solar cell 7 is maximized. Bidirectional DC /
DC converter 505 discharges or charges storage battery 506 for the adjusted Vdc value.
【００１４】次に、双方向ＡＣ／ＤＣ変換器５０２の構
成を図２に示す。双方向ＡＣ／ＤＣ変換器５０２は、４
個のＩＧＢＴ（Insulated Gate Bipolar Transisto
r）をフルブリッジ接続した電力変換器５０２１、交流
リアクトル５０２２、フィルタコンデンサ５０２３、電
力変換器５０２１の相電流を検出するための電流検出器
５０２４、相電流を検出して電力変換器５０２１へのゲ
ートパルス信号を出力する交流電流制御手段５０２５、
平滑コンデンサ５０１１，５０１２の直列電圧Vdcを検
出し、その値が所定の値となるように制御する直流電圧
制御手段５０２６、電力変換器５０２１の相電流と系統
電圧の検出値を用い、電力変換器５０２１から出力ある
いは入力する電力を演算する電力演算手段５０２７を有
している。電力変換器５０２１は単相３線出力で、平滑
コンデンサ５０１１、５０１２の中点Nを単相３線の中
点として出力する。Next, the configuration of the bidirectional AC / DC converter 502 is shown in FIG. The bidirectional AC / DC converter 502 has 4
IGBT (Insulated Gate Bipolar Transisto)
r), a power converter 5021, an AC reactor 5022, a filter capacitor 5023, a current detector 5024 for detecting a phase current of the power converter 5021, and a gate to the power converter 5021 by detecting a phase current. AC current control means 5025 for outputting a pulse signal,
DC voltage control means 5026 for detecting a series voltage Vdc of smoothing capacitors 5011 and 5012 and controlling the value to be a predetermined value, and a power converter using a phase current of power converter 5021 and a detected value of system voltage. A power calculation unit 5027 for calculating the power output or input from the 5021 is provided. The power converter 5021 is a single-phase three-wire output, and outputs the midpoint N of the smoothing capacitors 5011 and 5012 as the midpoint of the single-phase three-wire.
【００１５】また、双方向ＤＣ／ＤＣ変換器５０５の構
成を図３に示す。双方向ＤＣ／ＤＣ変換器５０５は、２
個のＩＧＢＴをハーフブリッジ接続した電力変換器５０
５１、直流リアクトル５０５２、平滑コンデンサ５０５
３、電流検出器５０５４、電流制御手段５０５５を有し
ている。電流制御手段５０５５は、電力変換器５０５１
のゲート信号を制御し、直列接続された平滑コンデンサ
５０１１、５０１２と蓄電池５０６との間で、双方向
（充電/放電）に電流を制御する。FIG. 3 shows the configuration of the bidirectional DC / DC converter 505. The bidirectional DC / DC converter 505 includes two
Converter 50 in which half IGBTs are half-bridge connected
51, DC reactor 5052, smoothing capacitor 505
3. It has a current detector 5054 and a current control means 5055. The current control unit 5055 includes a power converter 5051
, And bidirectionally (charge / discharge) current between the smoothing capacitors 5011 and 5012 and the storage battery 506 connected in series.
【００１６】図１に示す構成において、電源系統１から
の配線２に接続された負荷３の電力が、太陽電池７の発
電電力より大きい場合、太陽電池７の出力電力は、負荷
３で使われ、不足する電力分は、電源系統側１から供給
を受ける。電源系統１の電力を検出し、その検出値が所
定のしきい値を超えないように、蓄電池５０６の電力を
電源系統１に出力することで、負荷３の電力から太陽電
池７の発電電力を引いた値がしきい値を超える分だけ、
蓄電池５０６から出力することができる。ここで、充放
電制御手段５０８は、電力検出手段５０７で検出された
電源系統側電力から所定のしきい値を引いた値がゼロに
なるように、双方向ＤＣ／ＤＣ変換器を制御して蓄電池
５０６からの放電電流を制御する。In the configuration shown in FIG. 1, when the power of the load 3 connected to the wiring 2 from the power supply system 1 is larger than the power generated by the solar cell 7, the output power of the solar cell 7 is used by the load 3. Insufficient power is supplied from the power supply system side 1. By detecting the power of the power supply system 1 and outputting the power of the storage battery 506 to the power supply system 1 so that the detected value does not exceed a predetermined threshold, the power generated by the solar cell 7 can be converted from the power of the load 3. As much as the subtracted value exceeds the threshold,
Output can be made from the storage battery 506. Here, the charge / discharge control unit 508 controls the bidirectional DC / DC converter so that a value obtained by subtracting a predetermined threshold value from the power supply system side power detected by the power detection unit 507 becomes zero. The discharge current from the storage battery 506 is controlled.
【００１７】一方、太陽電池７の発電電力が負荷３の電
力より大きい場合には、負荷で消費される電力に対する
余剰分は電源系統１に売電される。この場合は、電力検
出手段５０７により検出される電源系統側の電力は負の
値となり、所定のしきい値以下であるため、蓄電池５０
６からの放電は行われない。On the other hand, when the power generated by the solar cell 7 is larger than the power of the load 3, a surplus of the power consumed by the load is sold to the power supply system 1. In this case, the power on the power supply system side detected by the power detection means 507 has a negative value and is equal to or less than a predetermined threshold value.
No discharge from 6 is performed.
【００１８】このように、電源系統側の電力を検出し、
その値に応じて、蓄電池５０６からの放電電力を制御す
ることにより、太陽電池７の発電状態や、負荷３の負荷
状態に係わらず、電源系統側の電力を所定のしきい値を
超えないように、電力ピーク補償できる。Thus, the power on the power system side is detected,
By controlling the discharge power from the storage battery 506 according to the value, the power on the power supply system side does not exceed a predetermined threshold value regardless of the power generation state of the solar cell 7 or the load state of the load 3. Power peak compensation.
【００１９】本実施の形態の動作波形を図４に示す。図
４（１）に負荷電力と太陽光発電電力の一例を示す。横
軸は時刻で、日中は、太陽光発電電力の大きさが日射量
の応じ、時刻とともに変化している。また、負荷電力
は、朝方と正午前後、および夕方にかけて、電力ピーク
がある場合を示す。ここで、夜間の電気料金の安い電力
を蓄電池５０６に蓄電したり、昼間に蓄電電力の不足分
を充電したりする場合に、電源系統１から入力する電力
を斜線で示した。更に、夜間の蓄電に備え、蓄電池５０
６の余剰電力を放電する部分を、余剰電力放電分として
示す。FIG. 4 shows operation waveforms of the present embodiment. FIG. 4A shows an example of load power and photovoltaic power. The horizontal axis represents time. During the daytime, the magnitude of the photovoltaic power changes with time according to the amount of solar radiation. The load power shows a case where there is a power peak in the morning, after noon, and in the evening. Here, the electric power input from the power supply system 1 is shown by hatching when electric power with a low electricity rate at night is stored in the storage battery 506 or the shortage of the stored electric power is charged during the day. In addition, the storage battery 50
The portion for discharging the surplus power of No. 6 is indicated as surplus power discharge.
【００２０】負荷電力から太陽光発電電力を引いた電力
値が、電源系統１から供給を受ける電力、すなわち購入
する電力となる。また、負荷電力より太陽光発電電力が
大きい場合には、その差分が電源系統１に対して売電す
る電力となる。その関係を図４（２）に示す。系統側の
電力、すなわち、電源系統１から購入する電力を検出
し、その値が所定のしきい値を超えないように、図４
（３）に示すように蓄電池５０６からピークカット放電
することで、図４（４）に示すように、電源系統１から
購入する電力がしきい値を超えないように制御できる。The power value obtained by subtracting the photovoltaic power from the load power is the power supplied from the power supply system 1, that is, the power to be purchased. When the photovoltaic power is larger than the load power, the difference is the power to be sold to the power supply system 1. The relationship is shown in FIG. The power on the system side, that is, the power purchased from the power supply system 1 is detected, and the power is detected so as not to exceed a predetermined threshold.
By performing peak cut discharge from the storage battery 506 as shown in (3), it is possible to control so that the power purchased from the power supply system 1 does not exceed the threshold as shown in FIG.
【００２１】本実施の形態によれば、太陽光発電と蓄電
とを組み合わせたシステムにおいて、電源系統１側の電
力を交流電流検出器６より検出し、電源系統１の電力が
所定の上限値を超えないように、蓄電池５０６からの放
電電力を制御する。このため、太陽電池７の発電電力が
売電されるような場合であっても、蓄電池５０６からの
放電は、電源系統１から購入する電力が所定の値以上の
場合に行う。この状態では、電力の売電はないので、蓄
電池５０６からの放電電力が売電されることはない。ま
た、太陽電池７の発電電力が得られる場合でも、負荷電
力が大きく購入電力が大きくなる場合には、蓄電池５０
６から放電することで、電気料金の安い夜間電力を負荷
電力のピーク時に使用することができるという利点があ
る。また、電源系統の電力値、電源系統への交流電力出
力値、電源系統からの交流電力入力値、蓄電手段から放
電される電力値、蓄電手段に充電される電力値を演算
し、表示器に表示することで、蓄電池５０６からのピー
クカット放電運転をモニタすることができ、本システム
の導入効果を示すことができる。更に、各電力値を積算
して電力量として表示することで、月間や年間のピーク
カット電力量を表示することができる。また、それらの
値を外部からモニタできるようにすることで、本システ
ムの導入による改善効果を数値として管理することがで
きる。According to the present embodiment, in a system in which solar power generation and power storage are combined, the power on the power supply system 1 side is detected by the AC current detector 6, and the power of the power supply system 1 reaches a predetermined upper limit. The discharge power from the storage battery 506 is controlled so as not to exceed. For this reason, even when the power generated by the solar cell 7 is sold, the discharge from the storage battery 506 is performed when the power purchased from the power supply system 1 is equal to or more than a predetermined value. In this state, no electric power is sold, and thus the electric power discharged from the storage battery 506 is not sold. Even when the power generated by the solar cell 7 can be obtained, if the load power is large and the purchased power is large, the storage battery 50
Discharging from 6 has the advantage that nighttime power with low electricity rates can be used at the peak of load power. In addition, the power value of the power system, the AC power output value to the power system, the AC power input value from the power system, the power value discharged from the power storage means, and the power value charged to the power storage means are calculated and displayed on the display. By displaying, the peak cut discharge operation from the storage battery 506 can be monitored, and the introduction effect of the present system can be shown. Furthermore, by integrating each power value and displaying the integrated value as a power amount, a monthly or yearly peak cut power amount can be displayed. In addition, by enabling these values to be monitored from the outside, the improvement effect of the introduction of the present system can be managed as a numerical value.
【００２２】本発明による第２の実施の形態の構成を図
５に示す。第１の実施例との相違点は、太陽電池７の出
力電圧を、ＤＣ／ＤＣ変換器５０９を用いて昇圧させた
出力を、平滑コンデンサ５０１、および双方向ＤＣ／Ｄ
Ｃに供給していることにある。これにより、太陽電池７
の出力電圧が低い場合でも、ＤＣ／ＤＣ変換器５０９に
より太陽電池電圧を調整し、双方向ＡＣ／ＤＣ変換器５
０２で交流電力に変換できる。これにより、太陽光発電
システムを広い運転領域で稼動させることができる。こ
のとき、蓄電池５０６からの放電電力は、第１の実施例
と同様に、双方向ＤＣ／ＤＣ変換器５０５により実行さ
れる。FIG. 5 shows the configuration of the second embodiment according to the present invention. The difference from the first embodiment is that an output obtained by boosting the output voltage of the solar cell 7 by using a DC / DC converter 509 is output to a smoothing capacitor 501 and a bidirectional DC / D converter.
C. Thereby, the solar cell 7
Even when the output voltage of the bidirectional AC / DC converter 5 is low, the DC / DC converter 509 adjusts the solar cell voltage.
02 can be converted to AC power. Thereby, the photovoltaic power generation system can be operated in a wide operation range. At this time, the discharge power from the storage battery 506 is executed by the bidirectional DC / DC converter 505 as in the first embodiment.
【００２３】本実施の形態によれば、太陽光発電システ
ムを広範な運転状態で動作させることができ、蓄電池５
０６による電力ピークカット補償の利用範囲を拡大する
ことができる。According to the present embodiment, the photovoltaic power generation system can be operated in a wide range of operating conditions, and
It is possible to expand the use range of the power peak cut compensation according to J.06.
【００２４】本発明による第３の実施の形態の構成を図
６により説明する。電源系統１の分電盤４に太陽光発電
システムのパワーコンディショナー６１が接続されてい
る。パワーコンディショナー６１は、逆流防止ダイオー
ド８を介して太陽電池７の発電電力を入力し、電源系統
１に対し、交流に変換された太陽電池の発電電力を出力
する。パワーコンディショナー６１の発電電力は、電源
系統１に接続された負荷３に供給させるとともに、発電
電力が負荷電力より大きい場合には、電源系統側に売電
する。パワーコンディショナー６１は、太陽電池７の発
電電圧を昇圧するためのＤＣ／ＤＣ変換器６１９、平滑
コンデンサ６１１、直流電力を電源系統１の位相に同期
した交流電力に変換するためのＡＣ／ＤＣ変換器６１
２、電源系統１とＡＣ／ＤＣ変換器６１２とを接続する
ための開閉器６１３、電源系統１の電圧を検出するため
の系統電圧検出用トランス６１４から構成される。The configuration of the third embodiment according to the present invention will be described with reference to FIG. The power conditioner 61 of the photovoltaic power generation system is connected to the distribution board 4 of the power supply system 1. The power conditioner 61 inputs the generated power of the solar cell 7 via the backflow prevention diode 8 and outputs the generated power of the solar cell converted into AC to the power supply system 1. The power generated by the power conditioner 61 is supplied to the load 3 connected to the power system 1 and, when the generated power is larger than the load power, sold to the power system. The power conditioner 61 includes a DC / DC converter 619 for boosting the generated voltage of the solar cell 7, a smoothing capacitor 611, and an AC / DC converter for converting DC power into AC power synchronized with the phase of the power supply system 1. 61
2, a switch 613 for connecting the power supply system 1 and the AC / DC converter 612, and a system voltage detection transformer 614 for detecting the voltage of the power supply system 1.
【００２５】これに対し、電源システム５１を、パワー
コンディショナー６１と同様に、電源系統１に対して連
系させる。電源システム５１は、蓄電池５１６、双方向
ＤＣ／ＤＣ変換器５１５、平滑コンデンサ５１１、双方
向ＡＣ／ＤＣ変換器５１２、開閉器５１３、系統電圧検
出用トランス５１４、電力検出手段５１７、充放電制御
手段５１８、表示器９１から構成されている。また、交
流電流検出器６は、パワーコンディショナー６１、およ
び電源システム５１の電源系統１への連系点より上流側
に設けられており、電源システム５１は、交流電流検出
器６より演算させる系統側電力が、所定のしきい値を超
えないように、蓄電池５１６の電力を双方向ＤＣ／ＤＣ
変換器５１５、双方向ＡＣ／ＤＣ変換器５１２を介し
て、電源系統１に放電する。また、表示器９１により、
そのときの電源システムから出力される電力、および電
源系統側の電力を表示する。On the other hand, the power supply system 51 is connected to the power supply system 1 like the power conditioner 61. The power supply system 51 includes a storage battery 516, a bidirectional DC / DC converter 515, a smoothing capacitor 511, a bidirectional AC / DC converter 512, a switch 513, a system voltage detection transformer 514, a power detection unit 517, and a charge / discharge control unit. 518, a display 91. The AC current detector 6 is provided upstream of the power conditioner 61 and the interconnection point of the power supply system 51 with the power supply system 1. The power supply system 51 is operated by the AC current detector 6 on the system side. The power of the storage battery 516 is bi-directional DC / DC so that the power does not exceed a predetermined threshold.
The power is discharged to the power supply system 1 via the converter 515 and the bidirectional AC / DC converter 512. In addition, by the display 91,
The power output from the power supply system at that time and the power on the power supply system side are displayed.
【００２６】電源システム５１は、パワーコンディショ
ナー６１による発電電力を含めた負荷電力に対し電力ピ
ークカット放電を実行するため、すでに述べた実施例と
同様に、負荷電力から太陽電池の発電電力を除いた値に
対して電力ピークカット制御を行う。また、太陽電池の
発電電力が負荷の電力より大きい場合は、太陽電池の発
電電力は、電源系統１に対して売電される。この場合に
は、電源系統側の電力は負となるので、電源系統側の電
力は所定の値以下と判断され、電源システム１から蓄電
池の電力を放電することはない。Since the power supply system 51 executes the power peak cut discharge on the load power including the power generated by the power conditioner 61, the power generated by the solar cell is removed from the load power as in the above-described embodiment. Power peak cut control is performed on the value. When the power generated by the solar cell is larger than the power of the load, the power generated by the solar cell is sold to the power supply system 1. In this case, since the power on the power system side is negative, the power on the power system side is determined to be equal to or less than a predetermined value, and the power of the storage battery is not discharged from the power system 1.
【００２７】本実施の形態によれば、太陽光発電システ
ムと分離して電源システム５１を設け、電源システム５
１への電源系統の電力検出点を、太陽光発電システム、
あるいは、電源システム５１の連系点より電源系統１の
上流側に設けることにより、太陽光発電システムのよう
に電源系統１に対して電力を出力する装置がある場合で
も、負荷が電源系統から供給を受ける電力が所定の設定
値以下なるように制御することができる。According to the present embodiment, the power supply system 51 is provided separately from the photovoltaic power generation system.
1, the power detection point of the power system,
Alternatively, by providing the power supply system 51 upstream of the power supply system 1 from the interconnection point of the power supply system 51, even if there is a device that outputs power to the power supply system 1 such as a photovoltaic power generation system, the load is supplied from the power supply system. The received power can be controlled so as to be equal to or less than a predetermined set value.
【００２８】次に、本発明による第４の実施の形態を図
７に示す。第３の実施の形態の場合と同様に、電源系統
１連系された太陽光発電システムに対し、電源システム
５２が同様に電源系統１対して連系されている。ここ
で、太陽光発電システムのパワーコンディショナー６２
は太陽電池７の発電電力を、ＡＣ／ＤＣ変換器６２２に
より、直接、交流電力に変換する。また、電源システム
５２は、蓄電池５２６の電力を、双方向ＡＣ／ＤＣ変換
器５２２により、直接、交流電力に変換し電源系統１に
対して出力する。このように、蓄電池５２６の充電、放
電制御と、その電力の交流変換を、ひとつの電力変換器
で実行するので、電力変換効率を向上でき、蓄電池５２
６による電力ピークカット制御を効率よく実行できる。
本実施の形態によれば、太陽光発電と蓄電とを組み合せ
たシステムを高効率に運転できるという利点がある。Next, a fourth embodiment according to the present invention is shown in FIG. As in the case of the third embodiment, the power supply system 52 is similarly connected to the power supply system 1 for the photovoltaic power generation system connected to the power supply system 1. Here, the power conditioner 62 of the solar power generation system
Converts the power generated by the solar cell 7 directly into AC power by the AC / DC converter 622. The power supply system 52 directly converts the power of the storage battery 526 into AC power by the bidirectional AC / DC converter 522 and outputs the AC power to the power supply system 1. As described above, since the charging and discharging control of the storage battery 526 and the AC conversion of the power are performed by one power converter, the power conversion efficiency can be improved, and the storage battery 52 can be improved.
6 can efficiently execute the power peak cut control.
According to the present embodiment, there is an advantage that a system combining solar power generation and power storage can be operated with high efficiency.
【００２９】[0029]
【発明の効果】本発明によれば、太陽光発電手段と蓄電
池による電力蓄電手段とを組み合わせたようなシステム
でも、電源系統の電力を監視しながら、蓄電池からの放
電電力を制御するため、蓄電池に蓄電された電力を電源
系統に売電したりすることなく、負荷電力のピークを低
減することができる。According to the present invention, even in a system in which photovoltaic power generation means and power storage means using a storage battery are combined, the discharge power from the storage battery is controlled while monitoring the power of the power supply system. The peak of the load power can be reduced without selling the power stored in the power supply system to the power supply system.
【図１】本発明の第１の実施の形態による構成図。FIG. 1 is a configuration diagram according to a first embodiment of the present invention.
【図２】図１に示す双方向ＡＣ／ＤＣ変換器の構成図。FIG. 2 is a configuration diagram of a bidirectional AC / DC converter shown in FIG.
【図３】図１に示す双方向ＤＣ／ＤＣ変換器の構成図。FIG. 3 is a configuration diagram of the bidirectional DC / DC converter shown in FIG. 1;
【図４】本発明の第１の実施の形態による動作波形。FIG. 4 is an operation waveform according to the first embodiment of the present invention.
【図５】本発明の第２の実施の形態による構成図。FIG. 5 is a configuration diagram according to a second embodiment of the present invention.
【図６】本発明の第３の実施の形態による構成図。FIG. 6 is a configuration diagram according to a third embodiment of the present invention.
【図７】本発明の第４の実施の形態による構成図。FIG. 7 is a configuration diagram according to a fourth embodiment of the present invention.
１．電源系統、３．負荷、４．分電盤、５．電源システ
ム、６．交流電流検出器、７．太陽電池、５０２．双方
向ＡＣ／ＤＣ変換器、５０５．双方向ＡＣ／ＤＣ変換
器、５０６．蓄電池、９．表示器1. Power supply system; Load, 4. Distribution board, 5. Power supply system, 6. 6. AC current detector; Solar cell, 502. Bidirectional AC / DC converter, 505. Bidirectional AC / DC converter, 506. Storage battery, 9; display
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5G003 AA06 BA01 DA07 DA18 GB03 5G066 HA15 HB06 HB09 JB03 5H007 BB07 CA01 CB04 CB05 DA04 DA05 DB01 DC02 DC03 GA06 GA09 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G003 AA06 BA01 DA07 DA18 GB03 5G066 HA15 HB06 HB09 JB03 5H007 BB07 CA01 CB04 CB05 DA04 DA05 DB01 DC02 DC03 GA06 GA09
Claims (4)
電源系統の電力又は太陽電池の発電電力を蓄電する蓄電
手段と、この蓄電手段に電力を充電する手段と、前記蓄
電手段から電力を放電する手段と、太陽電池又は蓄電手
段の電力を交流電力に変換し電源系統に出力する手段、
あるいは、電源系統から交流電力を入力する手段と、電
源系統側の電力を検出する手段とを有し、太陽電池の発
電電力を負荷に給電又は蓄電手段に充電し、負荷電力が
太陽光発電電力より小さい場合には、発電電力を電源系
統に売電すると共に、電源系統の電力が所定の値を超え
ないように蓄電手段に蓄電した電力を放電する系統連系
形電源システム。1. A means for inputting power generated by a solar cell,
Power storage means for storing the power of the power supply system or the power generated by the solar cell, means for charging the power storage means, means for discharging power from the power storage means, and power for the solar cell or power storage means to be AC power Means for converting and outputting to the power supply system,
Alternatively, it has means for inputting AC power from a power supply system and means for detecting power on the power supply system side, and supplies power generated by the solar cell to the load or charges the power storage means, and the load power is generated by the solar power generation power. When the power is smaller, a system interconnection type power supply system that sells generated power to a power supply system and discharges power stored in a power storage unit so that the power of the power supply system does not exceed a predetermined value.
と蓄電手段の出力電力とを直流側で連系する系統連系形
電源システム。2. The grid-connected power supply system according to claim 1, wherein the power generated by the solar cell and the output power of the storage means are connected on the DC side.
と蓄電手段の出力電力とを電源系統側で個別に連系する
系統連系形電源システム。3. The grid-connected power supply system according to claim 1, wherein the generated power of the solar cell and the output power of the power storage means are individually linked on the power supply system side.
電源系統への交流電力出力値、電源系統からの交流電力
入力値、蓄電手段から放電される電力値、蓄電手段に充
電される電力値又は各電力値の積算値を計測、もしくは
演算する手段を設け、前記各値を表示又は外部からモニ
タできることを特徴とする系統連系形電源システム。4. The power value of the power supply system according to claim 1,
A means for measuring or calculating an AC power output value to the power supply system, an AC power input value from the power supply system, a power value discharged from the power storage means, a power value charged to the power storage means or an integrated value of each power value. A grid-connected power supply system, wherein the respective values can be displayed or monitored externally.
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| JP2001173359A JP2002369406A (en) | 2001-06-08 | 2001-06-08 | System-interconnected power system |
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